Goodwil, Long-lived Assets, and Other Charges Goodwill Narrative details (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2016 ReportingUnits	Oct. 31, 2015 USD ($)	Jan. 31, 2017 USD ($) Divisions		Jan. 31, 2017 USD ($)		Jan. 31, 2017 USD ($) ReportingUnits		Jan. 31, 2016 USD ($) ReportingUnits	Jan. 31, 2015 USD ($) ReportingUnits	Oct. 31, 2016 USD ($)	Jan. 31, 2014 USD ($)
Goodwill [Line Items]
Number of reporting units in Aerostar Segment | ReportingUnits	1						1		2	2
Number of divisions operated in by Parent	3		3				3		4	4
Goodwill			$ 40,649		$ 40,649		$ 40,649		$ 40,672	$ 52,148		$ 22,274
Goodwill, Impairment Loss					0				11,497	0
Goodwill gross of accumulated impairment losses			52,146		52,146		52,146		52,169	52,148
Aerostar [Member]
Goodwill [Line Items]
Amount of estimated fair value that exceeded the net book value											$ 9,000
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount											30.00%
Goodwill			789		789		789		789	789		789
Goodwill, Impairment Loss									0
Vista Reporting Unit [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		(64.00%)
Reporting Unit, Carrying Amount in Excess of Fair Value		$ 14,000
Implied fair value amount less than carrying value recorded for the reporting unit		0
Goodwill			$ 0	[1]	$ 0	[1]	$ 0	[1]	0	11,497		$ 11,497
Goodwill, Impairment Loss									11,497
Vista Reporting Unit [Member] | Operating Income (Loss) [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 11,497							$ 11,497	$ 0

[1] The Company combined the Aerostar and Vista reporting units in fiscal 2017. No goodwill amount was transferred between reporting units due to the goodwill impairment loss recorded at the Vista reporting unit during fiscal 2016.